Certainly you must stop whatever action you are being attacked with...and you might use some skills that would be considered gross motor skills.

You must get yourself into a secure position be it the clinch, guard, mount..what not....however, once there, I find those that have finer motor skills that have learned how to correctly align their bodies, use proper posture, timing, subtleness, finese...etc...are the ones that will do well.

Of course, at what point to you divide gross and fine? A matter of semantics I suppose.